光电测距仪（含全站仪）的加常数是仪器测量结果的改正项目，是仪器检定项目非常重要的一项。
The additive constant of the electro-optical distancemeasuring instrument and the total station instrument are the correction of the survey results using these instruments.
光电测距仪（含全站仪）的加常数是仪器测量结果的改正项目，是仪器检定项目非常重要的一项。
The additive constant of the electro-optical distancemeasuring instrument and the total station instrument are the correction of the survey results using these instruments.
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